Some new results on the statistics of radio wave scintillation, 1. Empirical evidence for Gaussian statistics
| Autor: | R. C. Livingston, C. L. Rino, H. E. Whitney |
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| Rok vydání: | 1976 |
| Předmět: |
Physics
Atmospheric Science Signal processing Scintillation Ecology Gaussian Paleontology Soil Science Forestry Aquatic Science Oceanography symbols.namesake Geophysics Amplitude Space and Planetary Science Geochemistry and Petrology Statistics Earth and Planetary Sciences (miscellaneous) symbols Gaussian function Curve fitting In-phase and quadrature components Earth-Surface Processes Water Science and Technology Central limit theorem |
| Zdroj: | Journal of Geophysical Research. 81:2051-2057 |
| ISSN: | 0148-0227 |
| DOI: | 10.1029/ja081i013p02051 |
| Popis: | This paper presents an analysis of ionospheric scintillation data which shows that the underlying statistical structure of the signal can be accurately modeled by the additive complex Gaussian perturbation predicted by the Born approximation in conjunction with an application of the central limit theorem. By making use of this fact, it is possible to estimate the in-phase, phase quadrature, and cophased scattered power by curve fitting to measured intensity histograms. By using this procedure, it is found that typically more than 80% of the scattered power is in phase quadrature with the undeviated signal component. Thus, the signal is modeled by a Gaussian, but highly non-Rician process. From simultaneous UHF and VHF data, only a weak dependence of this statistical structure on changes in the Fresnel radius is deduced. The signal variance is found to have a nonquadratic wavelength dependence. It is hypothesized that this latter effect is a subtle manifestation of locally homogeneous irregularity structures, a mathematical model proposed by Kolmogorov (1941) in his early studies of incompressible fluid turbulence. |
| Databáze: | OpenAIRE |
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